Re: [B.A.T.M.A.N.] Alfred 2016.1 bind errors

[Jonathan Haws <Jonathan.Haws@sdl.usu.edu>]

On 05/07/2016 06:16 AM, Matthias Schiffer wrote:
> On 05/06/2016 10:45 PM, Jonathan Haws wrote:
>> I am trying to get familiar with the Alfred tools and downloaded version
>> 2016.1.  Unfortunately it didn't work - I couldn't get past a bind error:
>>
>> root@sierra1:~# ./alfred -m -i bat0
>> can't bind: Cannot assign requested address
>> Failed to open interfaces
>>
>> I had setup batman-adv with the commands:
>>
>> batctl if add eth0
>> ip link set up bat0 (eth0 was already up)
>>
>> I rolled back to 2015.0 (per a hint at
>> http://wiki.pinneberg.freifunk.net/alfred) and alfred started up just
>> fine instead of giving the error.  However it periodically gives the
>> following message:
>>
>> announce master ...
>> Error during sent: Cannot assign requested address
>>
>> I also tried alfred -m -i eth0 with the same results.
>>
>> Is there something wrong in my configuration?  Can anyone point me in
>> the right direction?  I've read through the Wiki for both batman-adv and
>> alfred and am out of ideas.
>>
>> I'm trying to prove this setup and get familiar with it in a virtual
>> environment, so I am using VirtualBox to setup a network of 4 nodes in
>> my mesh.  Should be simple enough, and batman-adv seems to work just
>> great - once its up and running, all nodes can communicate one with
>> another as expected.  Only issue is I am trying to get alfred to work
>> with batadv-vis to give me a graph to tell me it really is working right.
>>
>> Thoughts?
>> Thanks!
>> Jon
>>
>
> alfred explicitly binds to the link-local IPv6 address of the interface
> since version 2016.0. I suspect one of the following caveats might be your
> problem:
>
> * The link-local IPv6 address must match the MAC address of the interface
> (here bat0) (derived by flipping the 2 bit of the first byte, and adding
> fe80 and fffe); this ususally breaks when the MAC address is changed after
> the interface is up
> * The link-local address must not be tentative when alfred is started
> (duplicate address detection must have finished; this usually means that
> the interface must be up for 3 seconds before alfred is started)
>
> I hope this helps...

This does help.  I don't believe my system is configured to use IPv6 at 
the moment, though the kernel appears to have the right configuration.

root@sierra1:~# zcat /proc/config.gz | grep IPV6
CONFIG_IPV6=y
CONFIG_IPV6_ROUTER_PREF=y
# CONFIG_IPV6_ROUTE_INFO is not set
# CONFIG_IPV6_OPTIMISTIC_DAD is not set
# CONFIG_IPV6_MIP6 is not set
# CONFIG_IPV6_VTI is not set
CONFIG_IPV6_SIT=y
# CONFIG_IPV6_SIT_6RD is not set
CONFIG_IPV6_NDISC_NODETYPE=y
CONFIG_IPV6_TUNNEL=m
# CONFIG_IPV6_GRE is not set
# CONFIG_IPV6_MULTIPLE_TABLES is not set
# CONFIG_IPV6_MROUTE is not set
# CONFIG_NF_DEFRAG_IPV6 is not set
# CONFIG_NF_CONNTRACK_IPV6 is not set
# CONFIG_NF_REJECT_IPV6 is not set
# CONFIG_NF_LOG_IPV6 is not set
CONFIG_IP6_NF_MATCH_IPV6HEADER=m


Am I missing a kernel configuration or just some missing configuration 
on my network interfaces?

root@sierra1:~# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
group default
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
        valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
master bat0 state UP group default qlen 1000
     link/ether 08:00:27:09:a2:bc brd ff:ff:ff:ff:ff:ff
     inet 192.168.74.101/24 scope global eth0
        valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UP group default qlen 1000
     link/ether 08:00:27:b5:50:cb brd ff:ff:ff:ff:ff:ff
     inet 192.168.73.101/24 scope global eth1
        valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UP group default qlen 1000
     link/ether 08:00:27:30:0d:96 brd ff:ff:ff:ff:ff:ff
     inet 10.0.2.15/24 brd 10.0.2.255 scope global eth2
        valid_lft forever preferred_lft forever
5: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default
     link/sit 0.0.0.0 brd 0.0.0.0
6: bat0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UNKNOWN group default
     link/ether f2:52:c3:50:2e:d7 brd ff:ff:ff:ff:ff:ff


root@sierra1:~# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
DEFAULT group default
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
master bat0 state UP mode DEFAULT group default qlen 1000
     link/ether 08:00:27:09:a2:bc brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UP mode DEFAULT group default qlen 1000
     link/ether 08:00:27:b5:50:cb brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UP mode DEFAULT group default qlen 1000
     link/ether 08:00:27:30:0d:96 brd ff:ff:ff:ff:ff:ff
5: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group 
default
     link/sit 0.0.0.0 brd 0.0.0.0
6: bat0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UNKNOWN mode DEFAULT group default
     link/ether f2:52:c3:50:2e:d7 brd ff:ff:ff:ff:ff:ff